Chinese mother of  pearl pendant in a silver "cage".   Size is 26 mm high, 11 mm wide and 5 mm thick.  The pearl is natural and it was formed so each is slightly different.  These were purchased at the Hong Qiao Pearl Market in Beijing.  Very "yin" delicate appearance.  You can see the pearl all around in the "cage".  

Can be worn with a chain available for purchase in Ying Yu Jade Pendant Options Collection